Installation guide

Making External Connections to Cisco 4000 Series Routers 4-85

Network Connection Considerations

controller provides up to 24 virtual channels. Each virtual channel is presented to the

system as a serial interface that can be conﬁgured individually. This interface is the physical

media that supports ISDN PRI.

The CT1/PRI network processor module, shown in Figure 4-41, provides a controller for

transmitting and receiving data bidirectionally at the T1 rate of 1.544 Mbps. For wide-area

networking, the CT1/PRI module can function as a concentrator for a remote site.

Following are the T1 speciﬁcations:

• Transmission bit rate: 1.544 megabits per second (Mbps) ± 50 parts per million (ppm)

• Output pulse amplitude: 3.0 volts (V) ± 0.6V measured at DSX

• Output pulse width: 324 nanoseconds (ns) ± 54 ns

• Complies with all AT&T Accunet TR 62411 speciﬁcations

Figure 4-41 CT1/PRI Network Processor Module

H3155

cT1/ PRI

LOOPBACK

LOCAL ALARM

REMOTE ALARM

DB-15

female